阅读说明：本技术 一种pdf文件处理方法及系统 (PDF file processing method and system ) 是由 徐颖 朱文凯 张世杰 于 2021-08-24 设计创作，主要内容包括：本申请公开了一种PDF文件处理方法及系统,获取待预览PDF文件的页数,并根据待预览PDF文件的页数创建画布容器；画布容器的数量与所述待预览PDF文件的页数一致,通过预定义元素,对画布容器进行渲染,将待预览PDF文件关联至渲染后的画布容器中,读取画布容器中的待预览PDF文件,并将待预览PDF文件加载至预设页面中。通过上述方案,根据待预览PDF文件的页数创建画布容器,画布容器的数量与待预览PDF文件的页数一致,使得画布容器可存放待预览PDF文件,并通过HTML5框架将待预览PDF文件进行加载和展示,在兼容跨屏的同时又能保持PDF文件的输出,从而使得用户可以预览出PDF文件的内容,提高用户体验。(The application discloses a PDF file processing method and a PDF file processing system, wherein the page number of a PDF file to be previewed is acquired, and a canvas container is created according to the page number of the PDF file to be previewed; the number of the canvas containers is consistent with the number of pages of the PDF file to be previewed, the canvas containers are rendered through predefined elements, the PDF file to be previewed is associated to the rendered canvas containers, the PDF file to be previewed in the canvas containers is read, and the PDF file to be previewed is loaded to a preset page. By the scheme, the canvas container is created according to the number of pages of the PDF file to be previewed, the number of the canvas containers is consistent with the number of pages of the PDF file to be previewed, the PDF file to be previewed can be stored in the canvas container, the PDF file to be previewed is loaded and displayed through the HTML5 frame, the output of the PDF file can be kept while the PDF file is compatible to cross a screen, the content of the PDF file can be previewed by a user, and user experience is improved.)

1. A PDF file processing method is characterized by comprising the following steps:

acquiring the page number of a PDF file to be previewed, and creating a canvas container according to the page number of the PDF file to be previewed; the number of the canvas containers is consistent with the number of pages of the PDF file to be previewed;

rendering the canvas container by a predefined element;

associating the PDF file to be previewed to a rendered canvas container;

reading the PDF file to be previewed in the canvas container, and loading the PDF file to be previewed into a preset page.

2. The method of claim 1, wherein the obtaining the number of pages of the PDF file to be previewed and creating the canvas container according to the number of pages of the PDF file to be previewed comprises:

acquiring the page number of a PDF file to be previewed through a preset plug-in;

and creating a canvas container according to the page number of the PDF file to be previewed.

3. The method of claim 1, wherein the rendering the canvas container by the predefined element comprises:

defining the width of a window;

determining the height of the window according to the preset width-height ratio and the defined width of the window;

and rendering the canvas container according to the defined window width and the defined window height.

4. The method according to claim 1, wherein the associating the PDF file to be previewed into the rendered canvas container comprises:

defining a context variable and a virtual window variable in the predefined element;

and associating the page of the PDF file to be previewed to the context of the rendered canvas container through the context variable, the virtual window variable and a preset rendering function.

5. The method according to claim 1, wherein the reading the PDF file to be previewed in the canvas container and loading the PDF file to be previewed into a preset page comprises:

reading a PDF file to be previewed in the canvas container through a preset reading plug-in;

and loading the PDF file to be previewed into an HTML5 page.

6. A PDF file processing system, said system comprising:

the device comprises an acquisition unit, a storage unit and a display unit, wherein the acquisition unit is used for acquiring the page number of a PDF file to be previewed and creating a canvas container according to the page number of the PDF file to be previewed; the number of the canvas containers is consistent with the number of pages of the PDF file to be previewed;

a rendering unit for rendering the canvas container by a predefined element;

the association unit is used for associating the PDF file to be previewed to the rendered canvas container;

and the loading unit is used for reading the PDF file to be previewed in the canvas container and loading the PDF file to be previewed into a preset page.

7. The system of claim 6, wherein the obtaining unit comprises:

the acquisition module is used for acquiring the page number of the PDF file to be previewed through a preset plug-in;

and the creating module is used for creating a canvas container according to the page number of the PDF file to be previewed.

8. The system of claim 6, wherein the rendering unit comprises:

the first definition module is used for defining the width of the window;

the determining module is used for determining the height of the window according to the preset width-height ratio and the defined window width;

and the rendering module is used for rendering the canvas container according to the defined window width and the defined window height.

9. The system according to claim 6, wherein the association unit comprises:

a second definition module for defining a context variable and a virtual window variable in the predefined element;

and the association module is used for associating the page of the PDF file to be previewed to the context of the rendered canvas container through the context variable, the virtual window variable and a preset rendering function.

10. The system of claim 6, wherein the loading unit comprises:

the reading module is used for reading the PDF file to be previewed in the canvas container through a preset reading plug-in;

and the loading module is used for loading the PDF file to be previewed into an HTML5 page.

Technical Field

The invention relates to the technical field of file processing, in particular to a PDF file processing method and a PDF file processing system.

Background

Portable Document Format (PDF) is a Portable Document file Format, which is a file Format developed by Adobe Systems for exchanging files in a manner unrelated to application programs, operating Systems, and hardware. The PDF file is based on a PostScript language image model.

In the process of project development, when a plurality of pages of PDFs show business logic for a user, due to the fact that bottom-layer frames of the APPs embedded in the project are different, a blank phenomenon occurs when PDF files of individual native frames are shown, and the user cannot preview the content of the PDF files.

Therefore, the existing method for previewing the PDF causes poor user experience.

Disclosure of Invention

In view of this, the application discloses a PDF file processing method and system, which aim to keep the output of a PDF file while being compatible with a cross-screen, so that a user can preview the content of the PDF file, and user experience is improved.

In order to achieve the purpose, the technical scheme is as follows:

the first aspect of the present application discloses a PDF file processing method, where the method includes:

acquiring the page number of a PDF file to be previewed, and creating a canvas container according to the page number of the PDF file to be previewed; the number of the canvas containers is consistent with the number of pages of the PDF file to be previewed;

rendering the canvas container by a predefined element;

associating the PDF file to be previewed to a rendered canvas container;

reading the PDF file to be previewed in the canvas container, and loading the PDF file to be previewed into a preset page.

Preferably, the obtaining the number of pages of the PDF file to be previewed and creating the canvas container according to the number of pages of the PDF file to be previewed includes:

acquiring the page number of a PDF file to be previewed through a preset plug-in;

and creating a canvas container according to the page number of the PDF file to be previewed.

Preferably, the rendering the canvas container by the predefined element includes:

defining the width of a window;

determining the height of the window according to the preset width-height ratio and the defined width of the window;

and rendering the canvas container according to the defined window width and the defined window height.

Preferably, the associating the PDF file to be previewed into the rendered canvas container includes:

defining a context variable and a virtual window variable in the predefined element;

and associating the page of the PDF file to be previewed to the context of the rendered canvas container through the context variable, the virtual window variable and a preset rendering function.

Preferably, the reading the PDF file to be previewed in the canvas container and loading the PDF file to be previewed into a preset page includes:

reading a PDF file to be previewed in the canvas container through a preset reading plug-in;

and loading the PDF file to be previewed into an HTML5 page.

A second aspect of the present application discloses a PDF file processing system, the system comprising:

the device comprises an acquisition unit, a storage unit and a display unit, wherein the acquisition unit is used for acquiring the page number of a PDF file to be previewed and creating a canvas container according to the page number of the PDF file to be previewed; the number of the canvas containers is consistent with the number of pages of the PDF file to be previewed;

a rendering unit for rendering the canvas container by a predefined element;

the association unit is used for associating the PDF file to be previewed to the rendered canvas container;

and the loading unit is used for reading the PDF file to be previewed in the canvas container and loading the PDF file to be previewed into a preset page.

Preferably, the acquiring unit includes:

the acquisition module is used for acquiring the page number of the PDF file to be previewed through a preset plug-in;

and the creating module is used for creating a canvas container according to the page number of the PDF file to be previewed.

Preferably, the rendering unit includes:

the first definition module is used for defining the width of the window;

the determining module is used for determining the height of the window according to the preset width-height ratio and the defined window width;

and the rendering module is used for rendering the canvas container according to the defined window width and the defined window height.

Preferably, the association unit includes:

a second definition module for defining a context variable and a virtual window variable in the predefined element;

and the association module is used for associating the page of the PDF file to be previewed to the context of the rendered canvas container through the context variable, the virtual window variable and a preset rendering function.

Preferably, the loading unit includes:

the reading module is used for reading the PDF file to be previewed in the canvas container through a preset reading plug-in;

and the loading module is used for loading the PDF file to be previewed into an HTML5 page.

According to the technical scheme, the method and the system for processing the PDF file are used for acquiring the page number of the PDF file to be previewed and creating a canvas container according to the page number of the PDF file to be previewed; the number of the canvas containers is consistent with the number of pages of the PDF file to be previewed, the canvas containers are rendered through predefined elements, the PDF file to be previewed is associated to the rendered canvas containers, the PDF file to be previewed in the canvas containers is read, and the PDF file to be previewed is loaded to a preset page. By the scheme, the canvas container is created according to the number of pages of the PDF file to be previewed, the number of the canvas containers is consistent with the number of pages of the PDF file to be previewed, the PDF file to be previewed can be stored in the canvas container, the PDF file to be previewed is loaded and displayed through the HTML5 frame, the output of the PDF file can be kept while the PDF file is compatible to cross a screen, the content of the PDF file can be previewed by a user, and user experience is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic flowchart of a PDF file processing method disclosed in an embodiment of the present application;

fig. 2 is a schematic flow chart illustrating a process of acquiring the number of pages of a PDF file to be previewed and creating a canvas container canvas according to the number of pages, disclosed in the embodiment of the present application;

fig. 3 is a schematic flowchart illustrating a rendering process of a canvas container canvas by predefined elements according to an embodiment of the present application;

fig. 4 is a schematic flowchart illustrating a process of associating a PDF file to be previewed to a rendered canvas container canvas according to the embodiment of the present application;

fig. 5 is a schematic flow diagram illustrating a process of reading a PDF file to be previewed in a canvas container and loading the PDF file to be previewed into a preset page, disclosed in the embodiment of the present application;

fig. 6 is a schematic structural diagram of a PDF file processing system disclosed in the embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

As can be known from the background art, due to the fact that bottom-layer frames of the APPs embedded in the project are different, a blank phenomenon occurs when PDF files of individual native frames are displayed, and a user cannot preview the content of the PDF files, so that the user experience is poor due to the existing PDF previewing method.

In order to solve the problem, the embodiment of the application discloses a PDF file processing method and a PDF file processing system, wherein a canvas container is created according to the number of pages of a PDF file to be previewed, the number of the canvas containers is consistent with the number of pages of the PDF file to be previewed, the PDF file to be previewed can be stored in the canvas container, the PDF file to be previewed is loaded and displayed through a preset page, the output of the PDF file can be kept while the cross-screen is compatible, and therefore a user can preview the content of the PDF file and user experience is improved. The specific implementation is illustrated by the following examples.

Referring to fig. 1, a schematic flow diagram of a PDF file processing method disclosed in the embodiment of the present application is shown, where the PDF file processing method mainly includes the following steps:

s101: acquiring the page number of a PDF file to be previewed, and creating a canvas container canvas according to the page number of the PDF file to be previewed; the number of canvas containers canvas is consistent with the number of pages of the PDF file to be previewed.

In S101, the number N of pages (total number of pages) of the PDF file to be previewed is obtained by a preset plug-in, and the same number of canvas container canvases are created according to the number N of pages of the PDF file to be previewed. The same number of canvas container canvas is created for the PDF files to be previewed.

Wherein the value of N is an integer greater than or equal to 1.

The preset plug-in may be pdf.

The canvas container canvas is used for storing the pages converted by the PDF.

PDF is a file format developed by Adobe Systems for exchanging files independently of application programs, operating Systems, and hardware. The PDF file is based on a PostScript language image model, and accurate colors and accurate printing effects can be guaranteed regardless of the printer on which the PDF file is based, i.e., the PDF file reproduces each character, color, and image of an original.

Specifically, the process of creating the canvas container canvas according to the number of pages of the PDF file to be previewed is as follows:

js plug-in is introduced, then the page number N of the PDF file to be previewed is obtained through a numPages domain, and finally the canvas container canvas with the same number is created according to the page number N.

The code for the page number of the PDF file to be previewed is as follows:

s102: the canvas container canvas is rendered by predefined elements.

In S102, the predefined element is a canvas element.

Creating a canvas element, defining the window width of the canvas element (namely defining the width scaleW value of a PDF file to be previewed), determining the window height through presetting the width-height ratio and the defined window width, and rendering the canvas container canvas according to the defined window width and the defined window height of the canvas element.

The method comprises the steps of defining a width scaleW value of a PDF file to be previewed, and conducting height self-adaptation through the window width scaleW value, namely determining the height of a window through a preset width-height ratio and the defined window width, and ensuring that the PDF file to be previewed is converted into the window width and the window height in a canvas container canvas and not compressed.

Wherein the canvas element comprises an element ID, a window width, a window height, a context object, a virtual window viewport and the like.

The canvas element draws images on web pages using JavaScript, and has various drawing paths, rectangles, circles, characters, and methods of adding images.

The canvas container canvas is a rectangular area, each pixel of which can be controlled.

The element ID is used within the JavaScript programming language to find the canvas element.

The preset width-to-height ratio is set by a technician according to actual conditions, and the application is not particularly limited.

The window width and the window height are defined by setting the scaleW value, and the canvas container canvas is rendered by the defined window width and the defined window height.

The code to create the canvas element is as follows:

the code defining the canvas element is as follows:

among them, the getContext ('2d') object is a built-in HyperText Markup Language 5.0 (HTML 5) object having various drawing paths, rectangles, circles, characters, and methods of adding images.

S103: and associating the PDF file to be previewed to the rendered canvas container canvas.

In S103, a context variable and a virtual window variable in the canvas element are defined, a context variable context, a virtual window variable viewport and a preset rendering function in the canvas element are associated, and the PDF file to be previewed is associated to the rendered canvas container canvas.

The preset rendering function can be a render function or other functions, the specific preset rendering function is determined by technical personnel according to actual conditions, the method is not specifically limited, and the render function is preferably selected according to the preset rendering function.

Specifically, the process of associating the PDF file to be previewed to the rendered canvas container canvas is as follows:

firstly, defining a context object and a virtual window viewport in a canvas element, and then associating a page of a PDF file to be previewed to the context of a rendered canvas container canvas through a context variable context, a virtual window variable viewport and a render function.

And assigning the defined context and viewport to a page of the PDF file to be previewed through a render function.

The code for associating the PDF file to be previewed to the rendered canvas container canvas is as follows:

s104: reading a PDF file to be previewed in the canvas container canvas, and loading the PDF file to be previewed into a preset page.

In S104, the PDF file to be previewed in the canvas container canvas is read by the preset read plug-in, and the PDF file to be previewed is loaded into the preset page.

The preset reading plug-in may be pdf.

The preset page can be an HTML5 page, other pages and the like, the determination of the preset page is set by technical personnel according to actual conditions, the application is not particularly limited, and the preset page is preferably an HTML5 page.

HTML5 is a language description way to build Web content. HTML5 is the next generation standard for the internet, a language way to build and present internet content.

HTML5 was specifically designed to carry rich World Wide Web (Web) content and no additional plug-ins were required; possessing new semantics, graphics and multimedia elements; the new elements and new APIs provided by HTML5 simplify the building of web applications; HTML5 is cross-platform, designed to run on top of different types of hardware (PC, tablet, cell phone, tv, etc.).

Js plug-in, reading the PDF file to be previewed in the canvas container canvas, and loading the PDF file to be previewed into the HTML5 page. The PDF files of multiple pages can be previewed in the H5 project of the embedded APP, so that the user requirements and the service requirements are met, and the user experience is improved.

The code for reading the PDF file to be previewed in the canvas container canvas and loading the PDF file to be previewed into the HTML5 page is as follows:

for convenience of understanding the above procedure of the PDF file processing method, the following description is given by way of example:

for example, the total number of pages of the PDF file to be previewed is 10, a canvas container canvas is created according to the total number of pages 10 of the PDF file to be previewed, the number of the canvas container canvas is 10, and the preset width-to-height ratio is set to 10: 7. Creating a canvas element, defining a width scaleW value of a PDF file to be previewed, namely the window width is 10cm, carrying out height self-adaptation based on a preset width-height ratio (10:7) and the window width 10cm to obtain the window height of 7cm, rendering a canvas container canvas through the window width 10cm and the window height 7cm, associating 10 pages of PDF files to be previewed into the canvas container canvas with the width of 10cm and the height of 7cm, reading the PDF file to be previewed in the canvas container canvas, and loading the PDF file to be previewed into an HTML5 page.

In the embodiment of the application, the canvas container canvas is created according to the page number of the PDF file to be previewed, the number of the canvas container canvas is consistent with the page number of the PDF file to be previewed, the PDF file to be previewed can be stored in the canvas container canvas, the PDF file to be previewed is loaded and displayed through the HTML5 frame, the output of the PDF file can be kept while the cross-screen is compatible, the content of the PDF file can be previewed by a user, and the user experience is improved.

Referring to fig. 2, the process involved in S101, obtaining the number of pages of the PDF file to be previewed, and creating a canvas container canvas according to the number of pages of the PDF file to be previewed, mainly includes the following steps:

s201: and acquiring the page number of the PDF file to be previewed through a preset plug-in.

Js plug-in is introduced in S201, and the number N of pages of the PDF file to be previewed is obtained by a numPages method. Wherein the value of N is an integer greater than or equal to 1.

S202: a canvas container canvas is created according to the number of pages of the PDF file to be previewed.

In S202, the same number of canvas container canvases is created based on the page number N.

In the embodiment of the application, the page number of the PDF file to be previewed is acquired through the preset plug-in, and the purpose of creating the canvas container canvas according to the page number of the PDF file to be previewed is achieved.

Referring to fig. 3, the process of rendering the canvas container canvas by predefined elements in S102 mainly includes the following steps:

s301: a window width is defined.

S302: and determining the height of the window according to the preset width-height ratio and the defined width of the window.

S303: and rendering the canvas container canvas according to the defined window width and the defined window height.

The execution principle of S301 to S303 is consistent with the execution principle of S102, and reference may be made to this, which is not described herein again.

In the embodiment of the application, the height of the window is determined by presetting the width-height ratio and the defined window width, and the purpose of rendering the canvas container canvas is realized by the defined window width and the defined window height.

Referring to fig. 4, a process involved in the above S103 relating the PDF file to be previewed to the rendered canvas container canvas mainly includes the following steps:

s401: the context variable context and the virtual window variable viewport in the canvas element are defined.

S402: and associating the page of the PDF file to be previewed to the context of the rendered canvas container canvas through the context variable context, the virtual window variable viewport and a preset rendering function.

The execution principle of S401-S402 is consistent with the execution principle of S103, and may be referred to herein, and is not described herein again.

In the embodiment of the application, a context variable context and a virtual window variable viewport in a canvas element are defined, and the purpose of associating a page of a PDF file to be previewed to the context of a rendered canvas container canvas is achieved through the context variable context, the virtual window variable viewport and a preset rendering function.

Referring to fig. 5, the process involved in S104 of reading the PDF file to be previewed in the canvas container and loading the PDF file to be previewed into a preset page mainly includes the following steps:

s501: reading the PDF file to be previewed in the canvas container canvas through a preset reading plug-in.

The preset reading plug-in may be pdf.

S502: and loading the PDF file to be previewed into an HTML5 page.

The preset page can be an HTML5 page, other pages and the like, the determination of the preset page is set by a technician according to the actual situation, the application is not particularly limited, and the preset page is preferably an HTML5 page.

In the embodiment of the application, the PDF file to be previewed in the canvas container canvas is read through the preset reading plug-in, the PDF file to be previewed is loaded to the HTML5 page, the PDF file to be previewed is loaded and displayed through the HTML5 frame, the output of the PDF file can be kept while the cross-screen is compatible, and therefore a user can preview the content of the PDF file, and user experience is improved.

Based on the above embodiment and fig. 1, a PDF file processing method is disclosed, and a PDF file processing system is correspondingly disclosed in the embodiment of the present application, as shown in fig. 6. The PDF file processing system mainly includes an acquisition unit 601, a rendering unit 602, an association unit 603, and a loading unit 604.

An obtaining unit 601, configured to obtain the number of pages of a PDF file to be previewed, and create a canvas container canvas according to the number of pages of the PDF file to be previewed; the number of canvas containers canvas is consistent with the number of pages of the PDF file to be previewed.

The obtaining unit 601 obtains the number N of pages (total number of pages) of the PDF file to be previewed through a preset plug-in, and creates the same number of canvas container canvases according to the number N of pages of the PDF file to be previewed. The same number of canvas container canvas is created for the PDF files to be previewed.

A rendering unit 602, configured to render the canvas container canvas through predefined elements.

The rendering unit 602 creates a canvas element, defines a window width of the canvas element (that is, defines a width scaleW value of a PDF file to be previewed), determines a window height by presetting a width-to-height ratio and the defined window width, and renders the canvas container canvas with the defined window width and window height of the canvas element.

An associating unit 603, configured to associate the PDF file to be previewed to the rendered canvas container canvas.

The association unit 603 associates the context variable context, the virtual window variable viewport, and the preset rendering function in the canvas element with the PDF file to be previewed in the rendered canvas container canvas.

The loading unit 604 is configured to read a PDF file to be previewed in the canvas container canvas, and load the PDF file to be previewed into a preset page.

The loading unit 604 reads the PDF files to be previewed in the canvas container canvas through a preset read plug-in, and loads the PDF files to be previewed into a preset page.

Further, the acquisition unit 601 includes an acquisition module and a creation module.

And the acquisition module is used for acquiring the page number of the PDF file to be previewed through a preset plug-in.

And the creating module is used for creating a canvas container canvas according to the page number of the PDF file to be previewed.

Further, the rendering unit 602 includes a first defining module, a determining module, and a rendering module.

And the first defining module is used for defining the width of the window.

And the determining module is used for determining the height of the window according to the preset width-height ratio and the defined window width.

And the rendering module is used for rendering the canvas container canvas according to the defined window width and window height.

Further, the associating unit 603 includes a second defining module and an associating module.

And the second definition module is used for defining the context variable context and the virtual window variable viewport in the preset elements.

And the association module is used for associating the page of the PDF file to be previewed to the context of the rendered canvas container canvas through the context, the virtual window variable viewport and a preset rendering function.

Further, the loading unit 604 includes a reading module and a loading module.

And the reading module is used for reading the PDF file to be previewed in the canvas container canvas through a preset reading plug-in.

And the loading module is used for loading the PDF file to be previewed into the page of the HTML 5.

In the embodiment of the application, the canvas container canvas is created according to the page number of the PDF file to be previewed, the number of the canvas container canvas is consistent with the page number of the PDF file to be previewed, the PDF file to be previewed can be stored in the canvas container canvas, the PDF file to be previewed is loaded and displayed through the HTML5 frame, the output of the PDF file can be kept while the cross-screen is compatible, the content of the PDF file can be previewed by a user, and the user experience is improved.

While, for purposes of simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present application is not limited by the order of acts or acts described, as some steps may occur in other orders or concurrently with other steps in accordance with the application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required in this application.

It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the system-class embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.

The steps in the method of the embodiments of the present application may be sequentially adjusted, combined, and deleted according to actual needs.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The foregoing is only a preferred embodiment of the present application and it should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.